I do not gamble so much, but if I will choose a coin to use in gambling, it will mostly depend on what the casino I play with accepts for gambling. If they have bitcoins as a means of gambling and it it is a reputable casino with a good track record, I will gamble with bitcoins if that is what they accept. If it is a casino that what they accept is USDT, USDT will become the choice of what I gamble with. I will consider the reputation of the casino first, before their payment options. Whatever is acceptable in a good casino is what I will decide to play with.